Life Markers are the eighth upgrade in the purple middle branch, the efficiency branch, in the ability tree in Ori and the Blind Forest.
In order to obtain it, the player needs two ability points or above, or else they cannot unlock this ability. If the player still attempts to obtain it by clicking on it, the icon showing the upgrade will not light up.
This upgrade enables the player (Ori) to see the location of the Life Cells on the map.
The location of the Energy cells are shown by glowing green spheres that resemble smaller versions of energy cells, green with white trees on top.